Brake-shoe mold



Feb. 19 1924 J. S. THOMPSON BRAKE SHOE MOLD Filed July 20, 1925 Patented Feb. i9, i924.

le caricia.

JAMES S. THOMPSON, F PELEAM, NEW YORK.

BRAKE-SHOE MOLD.

Application tiled July 20, 1923.

To all whom 'it may conce/Mc:

Be it known that l, JAMES S. Tiroirrson, a citizen of the United States, residing at Pelham, in the county of Westchester and State of New York, have invented certain new and useful improvements in Brake- Shoe Molds, of which the following is a specication.

rlhis invention relates to the manufacture of brake shoes, and its object is broadly to facilitate the manufacture of brake shoes in permanent molds by providing a mold in which the parts to be embedded in the shoe casting can be easily inserted and support ed in position and which can be readily and quickly opened and closed so that the casting operation may be speedily and economically performed.

Another object of the invention is to provide a permanent mold of simple construction adapted for the reception of the attaching lug, the core for forming the opening in the lug and the reinforcing back, which can be conveniently inserted and easily supported in the mold` cavity preliminary to closing the mold for the casting operation.

In the accompanying drawing l have illustrated a selected embodiment of the invention, and referring thereto- Fig. 1 is a central sectional view on the line 1 1 of Fig. 2.k

Fig.-2 shows the mold of Fig. 1 partly in elevation and partly in longitudinal section.

Fig. 3 is a horizontal sectional view on the line 3-3 of Fig. 2.

Referring to the drawings, the mold comprises a drag member 6 and a cope comprising a relatively fixed member 7 anda slidable member 8. The drag is hinged at 9 to the fixed member 7 of the cope and is adapted to swing freely down from the cope as indicated in broken lines in Fig. 1. The cope member 8 is provided with ears V1() bored to receive theguide bars 11 mounted on the iiXed member 7 of the cope, and projecting forward to support the member 8 of the -cope in its sliding movement to and from closed position with relation to the other members of the mold. The drag member has one or more tongues 12 which are adapted to be secured in slotted keepers 13 by removable pins 14C to hold the drag in closed position against the cope. @ne or more 'clamping bars 15 is pivctally Serial No. 652,773.

secured to the fixed member 7 of the cope at 16 and carries a set screw 17 at its free end to engage the slidable member of the cope for holding the slidable member in proper relation to the fixed member of the cope during the casting operation. lhen the mold is closed, the two members of the cope will be held rigidiT clamped together and thedrag member will be held rigid in its proper relation to the cope.

The parting line between the two members of the cope extends longitudinally of the mold and substantially central of the mold cavity 18 which is formed, in the construction illustrated, almost entirely in the cope. A part of the mold cavity is located in one cope member and a part in the other cope member, and there is also an opening 19 of substantial size extending through the cope and communicating with the mold cavity. A sand plug 2O preferably carried by a holder 21 lits snugly in the opening 19 and it is provided with a recess 22V to form the attaching lug of the shoe casting.

In practice7 the mold having been opened to discharge a casting, the slidable cope member 8 is pushed into closed relation with the fixed cope member 7 and the clamp 15 applied to secure them together. Then the plug 20, with suspending wires 23 therein, is inserted in the opening 19 in the cope, the ends of the wires projecting well down into the mold cavity and suitably spaced apart. The attaching lug 24, the core 25 for formino' the opening in said lug and the reinforcing back 26 are then inserted in the mold cavity through the bottom thereof, assembled as a unit, and when properly positioned in the mold cavity the ends of the wires 28 are twisted together beneath the reinforcing back to hold this assembled back unit in position for the casting operation. The wires are spaced apart on opposite sides4 of the attaching lug and they are preferably spread by a support 27 eX- tending across the top of the plug so that the legs will project in parallel relation down through the plug on opposite sides of the reinforcing back, and when the ends of the wires are twisted together the .entire back unit will be held snugly and securely in place in the mold cavity. Y

l have shown a broad support 27 to eHect the spreading of the wires, but it will be understood that very little support is required to hold thewires in place, and while this broad siipfport ,seems` to be desirable for the purpose, the results desired can also be accomplished by other means, such as oneor Aiarrzmgenient,of the back unit during; the vcasting operation.'V Byprovidingf'the projectionQS tol engage `the top ofthe lugf24, the cast metal isfprevented' from flowing over the lug, and hence the lug willlb'e bare in the yfinishedcasting', l here the projection hasengaged with thelng.

I .have illustrated mypresent invention in ay mold adapted'ior castingfintegrahcomvposits bra'rlre'shoes having" chilled' ends and an intermediatesott cast iron i'v'earing face. The chilling ofk thefshoe casting iseitected bydire'ct Contact with the metal of the'mol'd, andto prevent this chilling effectfriom extendinglv throughout the shoe I provide refractory sectionsin the walls of the mold. The refractory section 29 in the drag and thel refractory sections L30 inthercope 'pre Avent the metal of the drag andcope from having' a chilling effect upon the'shoe Casting-opposite theretowhile the bare portions oit the walls ofthe mold c'zuity, atfthefends thereof, permit the shoecgistinfr` toi be chilled in the manner `and to theexten't desired.' I may providevthe'retractory materiall as seotions inserted .in thedragand cope,` or as a sectional 'coating applied to the dr land Cope* i .i i

Attertheback unit vhas been securedin placein the mold cavity the drag meinberlof the mold` is swungL ipwardv to closed pfosition withthetongue enrb mgthe slotted keeper andl the lpin Misinserted in vthekeeper` to holdthe drag member in place. ,Then the mold is ready for' theponring'operation and the cope is proyi'dedwith a pouring',fijate4 31 conveniently vdisposed,y

My invention` provides permanent mold of simple fand convenient terrn'fwhereby lbrakeshoes caribe-manufactured with facility, as1 scorriv and kbetter in qiialityfthan' in sandmolds, and more eclononfiically.J The sand coreprovides for, the escapeof gases and aterMthe"castinaf is made itv canfbe broken down to facilitate zthleirdischargepf theshoeicasenetfornv reasngfthica'st- A`does not drop ,out ofthe mold v,of its"A own weight when themoldisopenl Itwil'lfbe lifiesiieeebsfJette@ @o Ainthat position by tyiirq open fposition the shoe casting may be readily dischargedfrom the fixed member of the cope without injury to any of the parts ot the mold. By providing for the entire drag member toswing downward tree from the cope to leave the entire mold cavity open at fthe-bottom I greatly facilitate the operation of insertingrand tying the attaching lng, the core therefor and the reinforcing back, and these can be easily assembled and properly positioned in the'mold cavity and secured the wires with com# paratively little skill or eifort.

It the wires are' not destroyed in the casting operation,v they can be easily removed from theshoe casting by chiseling or otherwise.

I have illustrated the invention in a selected embodiment which I believe will be readily understood by these skilled in the part, but I do not wish to be restricted tothe use of, my invention forthe manufacture of can be usedy with satisfactory results in the production ot' other brake shoes, and other castings, and I- consider .myself entitled to make all lsuch changes in the forml` construction and arrangement of parts as fairly tall within the scope of the Afollowing claims.

IY claim:

l.' A` permanent mold for matting castings, comprising a drag and a cope having la mold cavity therein, said cope having opening communicating-with said cavity, a sand 4plug in ysaid opening, the dragmem ber being movable bodily away from the cope to leave the bottom of the'mold cavity opensc that parts toy be embedded in the casting; may be inserted inthe mold fe-vit;r through the bottom thereof, means carried by said plug for suspending saidparts in the mold cavity, and means for ecnring the members of the moldiny closed position during the casting operation.

`plug tin said opening,i the y.drag member being Vmovable bodily away .trein the cope membersl to leave "the bottom lofthe "mold cavityopen so that parts to be embedded in thevcasting may beinserted inthe mold cavity, means for securingthe'meinbers of thev mold in closed positionduri'ng'the casting operation.'

' 3. A permanent mold for making castings, comprising' a drag and al cope having ajmold cavity therein, said copeV havingan opening 'commnnicating with f said cavity, a

, y -,-J ,wir n, 'a' se@ elle ses@ Seel were sie cessed to form a part of the mold Cavity for the accommodation of the attaching lug, said drag being movable bodily away from the cope to leave the bottom of the mold Cavity open so that parts to be embedded in the casting may be inserted in the mold cavity through the bottom thereof, means carried by said plug for suspending said parts in the mold cavity, and means for securing the members of the mold in closed position during the casting operation.

4. ifi permanent mold for making eastings, comprising a drag member and a twomember cope having a mold cavity therein, said cope having an opening communicating With said cavity and one member of the cope being fixed and the other member being slidable, the drag member being hinged to the fixed cope member to swing freely away from the bottom of the eope and leave the cavity vopen at the bottom to permit the insertion of the parts to be embedded in the casting, a sand plug seated in said opening in the nope, and means extending through said plug and into the mold cavity to be engaged With said parts for suspending the parts in the mold cavity preliminary to closing the mold and during the casting operation.

5. A permanent mold for making castings, comprising a drag member and a twomember cope having a mold cavity therein, said cope having an opening communicating With said cayity and one member of the cope being fixed and the other member being slidable, the drag member being hinged to the fixed cope member to swing freely avvay from the bottom of the cope and leave the cavity open at the bottom to permit the insertion of the parts to be embedded in the casting, a sand plug seated in said opening in the Cope, and Wires carried by the plug and extending into the mold Cavity for engagement with said parts to suspend the parts in the mold preliminary to closing the mold and during the casting operation.

6. A permanent mold for making castings, comprising a drag and a cope having a mold Cavity therein, said cope having an opening communicating with said cavity and the drag member being movable away from the cope to leave the cavity open at the bottom to permit the insertion et the partsv to be embedded in the casting, a sand plug seated in said opening in the cope, and looped Wires embedded in the sand plug and projecting therethrough to enter the Cavity for engagement with said parts to suspend the parts in the Cavity preliminary to closing the mold and during the casting operation.

7. A permanent mold for making eastings, comprising a drag and a cope having a mold cavity therein, said cope having an opening communicating With said cavity and the drag being movable away from the cope to leave the cavity open at the bottom to permit the insertion of the parts to be embedded in the casting, a sand plug seated in said opening in the cope, looped Wires embedded in the plug and having their tree ends extending therethrough to enter the cavity Jfor engagement With said parts to suspend the parts in the mold preliminary to closing the mold and during the Casting operation, and a support extending across the top of the plug and engaging the looped portions of said Wires to hold the wires in place.

JAMES THOMPSON. 

